Liquid-fuel burner.



E. C. KAHN.

LIQUID FUEL BURNER. APPLICATION FILED SEPT. 4. 1917.

1,269, 1 9 1 o Patented June 11, 1918.

2 SHEETS-SHEET I.

E. C. KAHN.

LIQUID FUEL BURNER.

APPLICATION FILED SEPT. 4. 1911.

Patented June 11, 1918.

2 SHEETSSHEET 2.

F MILWAUKEE, WISCONSIN.

ileum-FUEL BURNER.

Specification. of Letters Patent. Patented June 11, 1918,

Application filed September 4, 1917. Serial N 0. 189,511.

- To all whom it may concern:

Be it known that I, EDWARD C. Kai-11v, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements in Liquid-Fuel Burners; and I do hereby declare that the following is a full, clear, and exact description thereof.

' My invention relates to certain new and useful improvements in liquid fuel burners, of that type exemplified in an applicati pn filed by me May 28, 1917, Serial No. 1 1.338.

It is in general the object of my invention to simplify the structure and to increase the efiiciency of burners of this character by providing a mixing and expansion chamber wherein air in correct proportion is drawn in by the entrance of fuel vapors and thoroughly co-mingled with the vapors by reason of the air and gas being caused to travel in eddying currents prior to their en trance into the burner head; and in which the fuel vapors fully expand in their whirling course through the chamber.

Another object resides in the provision of a burner ca juxtaposed and in counication with t e mixin and expansion cham-. her, and concaved in its under side to permit the continuation of the whirlin movements given the gases in the mixing c amber, and provided with a series of spaced slots in its outer peripheral edge to allow escapage of the gases for ignition.

Another object is to provide a burner head having its jet apertures so a ed with respect to the supply passages thereof as to prevent the possible occurrence of combustion within the burner head, it being more specifically an object to effect this re sult by so constructing the expansion and mixing'chamber as to insure the proper flow of fuel gas through the jet apertures.

A further object of the present invention is to provide means at the rear of the central intake channel and intermediate the outer mixing compartments whereby the currents of vapor and air are thoroughly broken and co-mingled.

A still further object of the herein disclosed invention is to provide a controli valve for thespray nozzle so constructed as to revent the accumulation of oil therein; an further to provide novel means for securing the spray nozzle to the burner.

With the above and other objects in view WhlCh will appear as the description procoeds, my invention resides in the novel construction, combination and arrangement of parts substantially as. hereinafter described and particularly defined by the appended clalms, it being understood. that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles of my invention, in which:

Figure 1 is a sectional view through my burner taken on the plane indicated by line 11 of Fig. 2, and

Fig. 2 is a top plan View thereof with parts broken away and in section to more clearly illustrate structural details.

Referring now more particularly to the accompanying drawings, 5 designates the upstanding supply pipe of a burner communicating with one end of a vaporizing pipe 6 having its other end in communication with the vertical leg 7 of a spray nozzle 8, including a needle valve 9 adapted to engage the spray opening 10 and having its shaft threaded for engagement with the horizontal internally threaded shank 11 of the nozzle, the needle valve being slotted as at 9 to prevent the accumulation of oil in the spray nozzle, as later described.

The vaporizing pipe 6 extends over a portion of the burner and is supported by means of the spray nozzle 8 which hasa stud or lug 12- formed on the vertical leg 7 and extending laterally therefrom to engage a recess 13 of an enlargement 13 formed on the peripheral wall of the burner. A pin or other fastening means 14 is passed through the enlar ementand stud 12 to detachably secure t e same therein, as best shown in Fig. 1.

The spray openin 10 is in line with the opening of the circu ar mixing or expansion chamber which comprises a central compartment or channel intake 15 defined by a pair of parallel walls 16 which terminate a spaced distance from the portion of the peripheral wall 17 of the mixing chamber opposite the mouth of the channel intake 15. The walls 16 are directed laterally and then rearwardly a spaced distance from the tit) mouth of the intake so that the main portion of said central compartment is of greater volume than its mouth for the pur-' vapor and air from forming a pocket intermediate the two outer chambers and thoroughly breaks the currents of air and gas prior to their entrance to the outer compartments whereby the same are more thoroughly cormingled than otherwise. type of burner exemplified in the aforementioned application, pockets of air and gas would accumulate at the rear of the central compartment 15 and thus the same would fire back through the central compartment, but by the provision of this bafiie plate this formation of the air and gas pocket is prevented and the danger of back fire entirely eliminated.

The. top wall 21 of the circular mixing or expansion chamber is provided with two sets or series of apertures 22 and 22' which communicate with the outermost portion of the outer compartments 18 and 19 respectively, a single opening 23 being also provided in the Wall 21 adjacent each wall 16 and communicating with the outer compartments 18 and 19, providing outlets for the mixed vapor and air. The top wall 21 is also provided at its outer peripheral edge with an upwardly and outwardly inclined flange 24: which forms a recess in which is seated a burner cap 25 forming with the wall a burner head and having its peripheral edge provided with an annular series of spaced lugs 26 nested between and evenly spaced from an annular series of spaced lugs 27 formed on the eripheral edge of the burner cap 25, said urner cap having itsperipheral edge inclined to correspond with the incline of flange 24. The lugs 26 and 27 of the flange 2d and burner cap 25 respectively are retained in spaced relation by means of projections 28 formed on certain of said lugs 26 and 27.

The outer periphery of the top wall 21 is provided with spaced ears or lugs 29 for spacing the same from a hood 30 to form an annular inlet air passage which has its upper portion 31, extending above the burner cap, inwardly and upwardly inclined. The bottom of the burner has depending centrally therefrom a socket 32 adaptedto receive a pedestal or other suit- In the able support 33, but if desired this manner of supporting the burner may be dispensed with and any other desired form employed. 1 From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent that the present structure is more efficient in operation than former devices of this character, in that when the vapor enters the central compartment 15, the same becomes heated from contact with the hot walls thereof, and in providing this compartment with the enlargement hereinbefore described, the expansion which necessarily follows the heating of the vapor is accommodated, and entirely eliminates excess pressure in the compartments and inthis manner prevents back firing which would necessarily result therefrom were the gas not permitted to expand.

It will be further noted that in providing the needle valve with the groove 9, as hereinbefore described, the same is prevented from forming a perfect seat to positively close the spray opening, and by this construction any oil which may accumulate in the spray nozzle, when the same is not in use, is allowed to drain as will be obvious. Were this oil permitted to remain in the spray nozzle, when the nozzle is initially heated prior to lighting the burner, the oil would vaporize and form considerable back pressure in the nozzle.

ll claim 1. lin a burner, a mixing chamber and burner head comprising a flat plate having a series of apertures therein, a distributing burner cap seated on said plate, a mixing and expansion chamber formed on the under side of said plate, and a pair of spaced substantially parallel transverse partitions in said chamber to divide the same in three compartments, the outermost only of said compartments registering with the apertures in said flat plate, one end of the central compartment being in communication with both outer compartments, the other end thereof having an inlet, whereby the fuel vapor is forced into the central compartment and distributed to the outer compartments, and then asses therefrom through said apertures in the fiat plate adjacent the peripheral portions thereof to be evenly distributed to said burner cap.

2. In a burner,'a mixing chamber, a pair of partitions in the chamber having their inner ends spaced from the rear portion of the peripheral side wall of said chamber and their outer ends outward of said mixing chamber whereby to provide an intake opening, said partitions defining the mixing chamber into a series of communicating compartments, a baffle plate disposed intermediate the communication of said compartments, and said central compartment having its inner portion of greater volume than it mouth, substantially as described. I

3. In a burner, a mixing chamber and burner head comprising a circular dish plate having a series of apertures therein, a distributing burner cap seated in the dish plate, a circular mixing and expansion chamber formed on the under side of said plate, said mixing and expansion chamber being divided into a series of compartments, the

outermost of said compartments registering with the apertures of said dish plate, an inlet opening formed by the central compartment of said mixing chamber, and means in said mixing chamber whereby to prevent the accumulation of gas pockets, substantially as described.

4. In a burner, a fuel supply having means for vaporizing the fuel, a spray nozzle at the termination of the fuel supply, a central channel formed by a pair of parallel walls, an expansion chamber communicating with said channel, said parallel walls,

extending into the chamber and defining a pair of outer communicating compartments and said central channel forming a central I distance from consin.

compartment, said parallel walls being directed laterally and then inwardly a spaced the outer ends thereof, an outlet in" the top wall of the expansion chamber and communicating with certain of the three compartments, :1 burner cap disposed above the outlet, and a bafiie plate interrupting the communications of .said compartments, the fuel vapor passing into the central channel and collecting sufficient air and expanding in thelarge portion of said channel formed by the laterally and inwardly directing of said walls, and said vapor pass ing out of the channel around the rear ends of said parallel walls into the outer compartment Where itis further expanded and then passes through the outlet of the burner cap, said baflie plate breaking the currents of vaporin their passage from the central channel to the outer compartments, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wis- EDWARD (J. KAHN. 

